Lighting module and lighting device comprising same

ABSTRACT

A lighting device disclosed in an embodiment of the invention includes a substrate; a plurality of light emitting devices on the substrate; a first reflective layer on the substrate; a resin layer on the first reflective layer; and a second reflective layer on the resin layer. The resin layer includes a first surface from which light emitted from the plurality of light emitting devices is emitted, and a second surface opposite to the first surface, wherein the first surface of the resin layer includes a first exit surface having a first curvature, and a second exit surface having a flat surface or a second curvature, wherein a maximum distance from the second surface to the first exit surface may be greater than a maximum distance from the second surface to the second exit surface.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation Application of U.S. patentapplication Ser. No. 17/438,504 filed Sep. 13, 2021, which is a U.S.National Stage Application under 35 U.S.C. § 371 of PCT Application No.PCT/KR2020/003810, filed Mar. 19, 2020, which claims priority to KoreanPatent Application No. 10-2019-0033183, filed Mar. 22, 2019, whoseentire disclosures are hereby incorporated by reference.

BACKGROUND 1. Field

An embodiment of the invention relates to a lighting device having aplurality of light sources or light emitting devices. An embodiment ofthe invention relates to a lighting device that provides a surface lightsource in the form of a line. An embodiment relates to a lighting devicehaving a lighting module. The embodiment relates to a light unit havinga lighting module, a liquid crystal display device, or a vehicle lamp.

2. Background

Lighting applications include vehicle lights as well as backlights fordisplays and signs. Light emitting device, such as light emitting diode(LED), have advantages such as low power consumption, semi-permanentlife, fast response speed, safety, and environmental friendlinesscompared to conventional light sources such as fluorescent lamps andincandescent lamps. These light emitting diodes are applied to variousdisplay devices, various lighting devices such as indoor or outdoorlights. Recently, as a vehicle light source, a lamp employing a lightemitting diode has been proposed. Compared with incandescent lamps,light emitting diodes are advantageous in that power consumption issmall. However, since an exit angle of light emitted from the lightemitting diode is small, when the light emitting diode is used as avehicle lamp, there is a demand for increasing the light emitting areaof the lamp using the light emitting diode. Since the light emittingdiode is small, it may increase the design freedom of the lamp, and itis economical due to its semi-permanent life.

BRIEF DESCRIPTION OF THE DRAWINGS

The embodiments will be described in detail with reference to thefollowing drawings in which like reference numerals refer to likeelements wherein:

FIG. 1 is a perspective view showing a lighting device according to anembodiment of the invention.

FIG. 2 is a plan view of the lighting device of FIG. 1 .

FIG. 3 is a front view of the lighting device of FIG. 1 .

FIG. 4 is a cross-sectional view taken along the B-B of the lightingdevice of FIG. 2 .

FIG. 5 is a cross-sectional view taken along the line C-C of thelighting device of FIG. 2 .

FIG. 6 is a cross-sectional view taken along the D-D of the lightingdevice of FIG. 2 .

FIG. 7 is a view for explaining a relationship between light emittingdevices and an exit surface in a resin layer of the lighting device ofFIG. 2 .

FIG. 8 is a view illustrating first and second exit surfaces facing thefirst and second light emitting devices in the resin layer of thelighting device of FIG. 2 .

FIG. 9 is a plan view illustrating a first modified example of alighting device according to an embodiment of the invention.

FIG. 10 is an enlarged view of the lighting device of FIG. 9 .

FIG. 11 is a view for explaining first and second exit surfaces in aresin layer of the lighting device of FIG. 9 .

FIG. 12 is a plan view illustrating another example of the lightingdevice of FIG. 2 .

FIG. 13 is a plan view illustrating another example of the lightingdevice of FIG. 10 .

FIG. 14 is a plan view illustrating a third modified example of alighting device according to an embodiment of the invention.

FIG. 15 is a side cross-sectional view illustrating a fourth modifiedexample of a lighting device according to an embodiment of theinvention.

FIGS. 16 and 17 are views showing flexible examples of lighting devicesaccording to the embodiment(s) of the invention.

FIG. 18 is an example of a lamp to which a lighting device according toan embodiment of the invention is applied.

FIG. 19 is an example of a front view of a light emitting device appliedto a lighting device according to an embodiment of the invention.

FIG. 20 is an example of a device in which the light emitting device ofFIG. 19 is disposed on a substrate.

FIG. 21 is a view of the device of FIG. 20 viewed from the other side.

FIG. 22 is a diagram illustrating a light distribution of the lightingdevice of FIG. 1 .

FIG. 23 is a diagram illustrating a light distribution of the lightingdevice of FIG. 9 .

DETAILED DESCRIPTION

Hereinafter, with reference to the accompanying drawings, a preferredembodiment in which a person of ordinary skill in the art to which theinvention pertains can easily practice the invention will be describedin detail. However, it should be understood that the configuration shownin the embodiments and drawings described in this specification is onlya preferred embodiment of the invention, and there may be variousequivalents and modifications that can be substituted for them at thetime of the present application.

In the detailed description of the operating principle of the preferredembodiment of the invention, if it is determined that a detaileddescription of a related well-known function or configuration mayunnecessarily obscure the subject matter of the invention, the detaileddescription thereof will be omitted. The terms described below are termsdefined in consideration of functions in the invention, and the meaningof each term should be interpreted based on the content throughout thisspecification. The same reference numerals are used throughout thedrawings to refer to parts having similar functions and functions.

The lighting device according to the invention may be applied to variouslamp devices that require lighting, such as vehicle lamps, householdlighting devices, and industrial lighting devices. For example, whenapplied to vehicle lamps, head lamps, car lights, side mirror lights,fog lights, tail lamps, brake lights, daytime running lights, vehicleinterior lights, door scars, rear combination lamps, backup lamps, it isapplicable to back. The lighting device of the invention may be appliedto indoor and outdoor advertising devices, display devices, and variouselectric vehicle fields. In addition, it may be applied to alllighting-related fields or advertising-related fields that are currentlydeveloped and commercialized or may be implemented according to futuretechnological development.

Hereinafter, the embodiments will be apparent through the description ofthe accompanying drawings and embodiments. In the description of theembodiments, each layer (film), region, pattern or structure is formed“on” or “under” of the substrate, each layer (film), region, pad orpatterns. In the case described as, “on” and “under” include both“directly” or “indirectly” formed through another layer. In addition,the criteria for the top or bottom of each layer will be described basedon the drawings.

Lighting Device

FIG. 1 is a perspective view showing a lighting device according to anembodiment of the invention, FIG. 2 is a plan view of the lightingdevice of FIG. 1 , FIG. 3 is a front view of the lighting device of FIG.1 , FIG. 4 is a cross-sectional view taken along the B-B of the lightingdevice of FIG. 2 , FIG. 5 is a cross-sectional view taken along the lineC-C of the lighting device of FIG. 2 , FIG. 6 is a cross-sectional viewtaken along the D-D of the lighting device of FIG. 2 , FIG. 7 is a viewfor explaining a relationship between light emitting devices and an exitsurface in a resin layer of the lighting device of FIG. 2 , and FIG. 8is a view illustrating first and second exit surfaces facing the firstand second light emitting devices in the resin layer of the lightingdevice of FIG. 2 .

Referring to FIGS. 1 to 8 , the lighting device 200 according to anembodiment of the invention includes a plurality of light emittingdevices 105, and the light emitted from the light emitting devices 105may be emitted as a line-shaped surface light source. The plurality oflight emitting devices 105 may be arranged in a plurality of rows. Theplurality of rows may be two or more, and will be described as, forexample, two rows. The light emitting device 105 may include a pluralityof first light emitting devices 101 and a plurality of second lightemitting devices 103. The plurality of first light emitting devices 101may be disposed in a first row, and the plurality of second lightemitting devices 103 may be disposed in a second row. The plurality offirst light emitting devices 101 and the plurality of second lightemitting devices 103 may be arranged in different rows. For example,each of the plurality of second light emitting devices 103 may berespectively disposed at a position moved in the first direction from aregion between the plurality of first light emitting devices 101. Theplurality of first light emitting devices 101 and the plurality ofsecond light emitting devices 103 may not overlap in the seconddirection X. The first light emitting device 101 and the second lightemitting device 103 may not overlap in the first direction Y. Here, thefirst direction Y may be a direction orthogonal to a direction in whichthe first light emitting devices 101 are arranged. The direction inwhich the first light emitting devices 101 are arranged may be thesecond direction X, or a direction orthogonal to the first direction Yand the third direction Z. Each of the first and second light emittingdevices 101 and 103 may be defined as a light source.

An interval between the plurality of first light emitting devices 101may be arranged at a first interval G1, and an interval between theplurality of second light emitting devices 103 may be arranged at asecond interval G2. The first interval G1 may be the same as the secondinterval G2. The interval between the adjacent first and second lightemitting devices 101 and 103 may be smaller than the first interval G1and the second interval G2. A shape connecting the centers of the firstand second light emitting devices 101 and 103 may be arranged in azigzag shape. The first interval G1 and the second interval G2 may begreater than the thickness of the lighting device 200, for example, avertical distance from the lower surface of the substrate 210 to theupper surface of the second reflective layer 240. For example, when thevertical distance is Z1, the intervals G1 and G2 may be three or moretimes the Z1. The first interval G1 and the second interval G2 may be 10mm or more, for example, in a range of 10 mm to 20 mm. When theintervals G1 and G2 are larger than the above range, the luminousintensity may be decreased, and when smaller than the above range, thenumber of the light emitting devices 101 and 103 may be increased.

As shown in FIGS. 4 to 6 , in the lighting device 200, the lengthX1(FIG. 6 ) in the row direction or the second direction X may begreater than the length Y1 in the column direction or the firstdirection Y. The lengths Y1 and X1 in the first and second directions Yand X may be greater than the thickness Z1 or the height of the lightingdevice 200 in the third vertical direction Z. The length X1 of thesecond direction X in the lighting device 200 may vary depending on thenumber of the light emitting devices 105 disposed therein, and may be,for example, 30 mm or more. The length Y1 in the first direction Y mayvary depending on the number of rows of the light emitting devices 105,and may be, for example, 16 mm or more and may be smaller than thelength X1 in the second direction X. The lighting device 200 may providea region in which the light emitted from the light emitting device 105is diffused and a region protecting the rear of the light emittingdevice 105. The lighting device 200 may be a flexible module or a rigidmodule. The lighting device 200 may be flat or flexible in at least oneof the first and second directions Y and X. The lighting device 200 maybe provided as a module having flexibility in the second direction X.

The light emitting device 105 may be disposed between the layers of thereflective material facing each other in the vertical direction, or maybe disposed adjacent to any one layer in the region between the layersof a reflective material facing each other in the vertical direction.The light emitting device 105 may be disposed between a supportingmember and a reflective member or layer that are vertically opposed toeach other. The light emitting device 105 may emit light in at least onedirection or may emit light in a plurality of directions. Each side ofthe lighting device 200 may have the same thickness or the same heightas each other. The light emitting device 105 may be sealed by a layer ofa transparent resin material, and the layer of the resin material may bedisposed between layers of a reflective material or between a supportingmember and a reflective layer or member.

The lighting device 200 may include a substrate 210, a resin layer 220on the substrate 210, and a second reflective layer 240 on the resinlayer 220. The lighting device 200 may include a first reflective layer230 between the substrate 210 and the resin layer 220. The resin layer220 may be disposed on the light emitting devices 105. The resin layer220 may be disposed on each side of the light emitting device 105,between adjacent light emitting devices 105, or disposed on upperportion of each of the light emitting devices 105.

The substrate 210 includes a printed circuit board (PCB), for example, aresin-based printed circuit board (PCB), a metal core PCB, a flexiblePCB, and a ceramic PCB., or a FR-4 substrate. The substrate 210 may be aflexible or non-flexible substrate. A circuit pattern may be disposed onthe substrate 210. The circuit pattern of the substrate 210 may includea plurality of pads in a region corresponding to the light emittingdevice 105. The circuit pattern in the substrate 210 may be disposed onan upper portion, or may be disposed on an upper portion and a lowerportion.

The resin layer 220 may be disposed on the substrate 220. The resinlayer 220 may be disposed between the substrate 210 and the secondreflective layer 240. The resin layer 220 may be disposed between theupper surface of the substrate 210 and the lower surface of the secondreflective layer 240. The resin layer 220 may surround or embed theplurality of light emitting devices 105 disposed on the substrate 210.The resin layer 220 may be a light-transmitting layer. The resin layer220 may include a glass material as another material. The n number ofthe plurality of first light emitting devices 101 may be disposed in afirst row or along a first line. The m number of the plurality of secondlight emitting devices 103 may be disposed in a second row or secondline. The above n≥m is satisfied, and n and m may be integers of 2 ormore.

As shown in FIGS. 1 to 6 , the resin layer 220 may include a firstsurface S1, a second surface S2 opposite to the first surface S1, athird surface S3 that is a lower surface, a fourth surface S4 that is anupper surface, an outer fifth surface S5 and an outer sixth surface S6.The first surface S1 may be an exit surface from which the light emittedfrom the light emitting device 105 is emitted. The first surface S1 maybe a front surface or an exit surface, and the second surface S2 may bea rear surface or a non-exit surface. In the resin layer 220, the firstsurface S1 and the second surface S2 may be disposed opposite to eachother with respect to the first direction Y, and the fifth surface S5and the second surface S2 may be disposed on opposite sides of eachother. The six surfaces S6 may be disposed opposite to each other withrespect to the second direction X, and the third and fourth surfaces S3and S4 are orthogonal to the vertical direction, that is, disposedopposite to each other with respect to the third direction Z. The firstsurface S1 is a surface from which light is emitted, and a verticalsurface having a predetermined height may extend in the second directionX. As another example, the first surface S1 may be a curved surfaceconvex with respect to a vertical direction, an inclined structureprotruding from an upper end to a lower end, or an inclined structureprotruding from the upper end to the lower end. The first and secondsurfaces S1 and S2 and the fifth and sixth surfaces S5 and S6 may be apart of each side of the lighting device 200, and may extend in avertical direction from each side of the first and second reflectivelayers 230 and 240 or/and the substrate 210. In the resin layer 220, thelengths of the first and second surfaces S1 and S2 in the seconddirection X may be greater than the lengths of the fifth and sixthsurfaces S5 and S6 in the first direction Y. The length of the firstsurface S1 in the second direction X may be the length of a straightline between one end of the fifth surface S5 and one end of the sixthsurface S6. The length in the second direction X of the second surfaceS2 may be a length of a straight line between the other end of the fifthsurface S5 and the other end of the sixth surface S6. A length in thefirst direction Y of the first surface S1 and the second surface S2 maybe greater than a height or thickness in the vertical direction. Thefirst surface S1 may be transparent or a surface through which light isemitted. At least one of the first surfaces S1 may face the emissionportions 111 and 113 of the light emitting device 105. For example, thefirst surface S1 may face the emission portions 111 and 113 of the firstand second light emitting devices 101 and 103. At least one side fromwhich light is emitted among the side surfaces of the first lightemitting device 101 is a first emission portion 111, and at least oneside from which light is emitted among the side surfaces of the secondlight emitting device 103 is a second emission portion 113. The firstsurface S1 may be a surface from which light is emitted, and may be asurface on which a shape for regularly emitting light or aconcave-convex structure is arranged. The first surface S1 may be aregion having a larger surface area than that of the opposite secondsurface S2. The first surface S1 may include a first exit surface S11facing the first light emitting device 101 and a second exit surface S12facing the second light emitting device 103. The first exit surface S11may face or face the first emission portion 111 of the first lightemitting device 101. The second exit surface S12 may face or face thesecond emission portion 113 of the second light emitting device 103. Thefirst and second exit surfaces S11 and S12 may be surfaces on which theresin layer 220 is exposed, or a surface on which light having a higherluminous intensity than other surfaces is emitted. The first and secondexit surfaces S11 and S12 may be an outer side disposed between theplurality of reflective layers 230 and 240 or an outer side disposedbetween the substrate 210 and the second reflective layer 240.

The first exit surfaces S11 may be disposed in plurality, and theplurality of first exit surfaces S11 may be spaced apart from eachother. The second exit surface S12 may be disposed in plurality, and maybe respectively disposed between the first exit surfaces S11. The firstand second exit surfaces S11 and S12 may be alternately disposed. Anexit surface disposed at the outermost side on the first surface S1 inthe first direction Y may be the first exit surface S11. The outermostfirst exit surface S11 may extend from the fifth surface S5 or mayextend from the sixth surface S6. A center of each of the plurality offirst exit surfaces S11 may be disposed at a position corresponding to acenter of each of the plurality of first light emitting devices 101. Acenter of each of the plurality of second exit surfaces S12 may bedisposed at a position corresponding to a center of each of theplurality of second light emitting devices 103. Each of the plurality offirst light emitting devices 101 may not overlap each of the pluralityof second light emitting devices 103 in the first direction Y. The firstexit surface S11 and the second exit surface S12 may not overlap in thefirst direction Y.

The resin layer 220 may cover or mold the first and second lightemitting devices 101 and 103. The first and second light emittingdevices 101 and 103 may include light emitting chips. The first andsecond light emitting devices 101 and 103 may include reflectivesidewalls surrounding the outside of the light emitting chip. Thereflective sidewall may have a structure in which a region facing thefirst surface S1 of the resin layer 220 is open and surrounds theperiphery of the light emitting chip. The reflective sidewall may be apart of the first and second light emitting devices 101 and 103 or maybe separately provided with a reflective material. Sides of the firstand second light emitting devices 101 and 103 except for the emissionportions 111 and 113 may be formed of a reflective material or atransparent or opaque material.

The first and second light emitting devices 101 and 103 may have abonding portion disposed thereunder and may be electrically connected tothe pad of the substrate 210. The first and second light emittingdevices 101 and 103 may be connected in series by a circuit pattern ofthe substrate 210 or may be in series-parallel, parallel-series orparallel. As another example, the first and second light emittingdevices 101 and 103 may be connected in various groups by a circuitpattern of the substrate 210. The first and second light emittingdevices 101 and 103 may include a device including a light emitting chipor a package in which an LED chip is packaged. The light emitting chipmay emit at least one of blue, red, green, and ultraviolet (UV) light.The first and second light emitting devices 101 and 103 may emit atleast one of white, blue, red, and green. The first and second lightemitting devices 101 and 103 may emit light in a lateral direction, anda bottom portion may be disposed on the substrate 210. The first andsecond light emitting devices 101 and 103 may be a side view typepackage. As another example, the first and second light emitting devices101 and 103 may be LED chips, and one surface of the LED chip may beopened and a reflective member may be disposed on the other surface.

As shown in FIG. 6 , the height Z2 from the lower surface of thesubstrate 210 to the upper surface of the light emitting device 105 maybe 2.5 mm or less, for example, 2 mm or less, or 1.5 mm to 2 mm. Byproviding such a small height Z2, the height of the line light sourcemay be reduced.

The resin layer 220 may include a first convex portion P1 that has afirst exit surface S11 and protrudes from the first surface S1. Thefirst convex portion P1 may have a convex first exit surface S11 or afirst convex surface disposed in the direction of the first surface S1.In the resin layer 220, a second exit surface S12 may be disposed in aregion between the first convex portions P1 on the first surface S1. Thesecond exit surface S12 may be a flat surface or may include aprotruding second convex portion P2 or a second convex surface as shownin FIG. 9 . The resin layer 220 or the lighting device 200 may include arecessed portion C1 recessed in the direction of the second surface S2in a region between the first convex portions P1. The recessed portionC1 may overlap a region of the second exit surface S12 in the seconddirection X. The recessed portions C1 may be disposed between the firstconvex portions P1, respectively. The recessed portion C1 may be spacedapart from the fifth and sixth surfaces S5 and S6.

As shown in FIGS. 3 to 6 , the resin layer 220 may be disposed on thesubstrate 210. The first reflective layer 230 may be disposed betweenthe resin layer 220 and the substrate 210. The resin layer 220 may be incontact with upper surfaces and side surfaces of the first and secondlight emitting devices 101 and 103. The resin layer 220 may be incontact with an upper surface of the first reflective layer 230. Aportion of the resin layer 220 may be in contact with the substrate 210through a hole in the first reflective layer 230. The resin layer 220may be in contact with the emission portions 111 and 113 of the firstand second light emitting devices 101 and 103. The first surface S1, thesecond surface S2, the fifth surface S5, and the sixth surface S6 of theresin layer 220 are outer surfaces between the first and secondreflective layers 230 and 240. The first surface S1, the second surfaceS2, the fifth surface S5, and the sixth surface S6 may be peripheralsides of the light emitting device 105 or corresponding sides to theside surfaces of the light emitting device 105. The fourth surface S4 ofthe resin layer 220 may contact the second reflective layer 240, and thethird surface S3 may contact the first reflective layer 230. The thirdsurface S3 and the fourth surface S4 may be horizontal to each other. Inthe absence of the first reflective layer 230, the third surface S3 maybe in contact with the substrate 210. When the lighting device is flat,the third and fourth surfaces S3 and S4 may include a flat surface.

Referring to FIGS. 3 to 6 , an area of the third surface S3 of the resinlayer 220 may be the same as an area of the upper surface of thesubstrate 210. The area of the third surface S3 of the resin layer 220may be the same as the area of the upper surface of the first reflectivelayer 230. The area of the third surface S3 of the resin layer 220 maybe the same as the area of the upper surface of the second reflectivelayer 240. A length of the resin layer 220 in the second direction X maybe the same as a length (e.g., X1) of the substrate 210. The maximumlength of the resin layer 220 in the second direction X may be the sameas the maximum length of the first reflective layer 230 or the secondreflective layer 240. The maximum length (e.g., Y1) of the resin layer220 in the first direction Y may be the same as a maximum length of thesubstrate 210. The maximum length (e.g., Y1) of the resin layer 220 inthe first direction Y may be the same as a maximum length of the firstreflective layer 230. The maximum length (e.g., Y1) of the resin layer220 in the first direction Y may be the same as a maximum length of thesecond reflective layer 240. The minimum length (e.g., Y2) of the resinlayer 220 in the first direction Y may be the same as a minimum lengthof the substrate 210. The minimum length (e.g., Y2) of the resin layer220 in the first direction Y may be the same as a minimum length of thefirst reflective layer 230 or the second reflective layer 240. Themaximum length Y1 in the first direction Y may be a length between theapex (or the outermost point) of the first convex portion P1 of thelighting device and the second surface S2, and the minimum length Y2 maybe a length between a point of the second exit surface S12 of thelighting device and the second surface S2. The resin layer 220 may bedisposed between the first and second reflective layers 230 and 240. Thefirst and second reflective layers 230 and 240 may have the same areaand may face each other on the third surface S3 and the fourth surfaceS4 of the resin layer 220. Accordingly, the resin layer 220 may diffusethe light emitted from the light emitting device 105 and the lightreflected by the first and second reflective layers 230 and 240 to guideand emit the light in the direction of the first surface S1.

As shown in FIG. 4 , the resin layer 220 may be formed to have athickness Zb greater than that of the light emitting device 105. Aportion of the resin layer 220 may be disposed between the first andsecond light emitting devices 101 and 103 and the second reflectivelayer 240. Accordingly, the resin layer 220 may protect the upperportions of the first and second light emitting devices 101 and 103 andprevent moisture penetration. Since the substrate 210 is disposed on thelower portion of the light emitting device 105 and the resin layer 220is disposed on the upper portion of the light emitting device 105, thelight emitting device 105 may be protected. Accordingly, the intervalbetween the fourth surface S4 of the resin layer 220 and the uppersurface of the light emitting device 105 may be 0.6 mm or less, forexample, in a range of 0.5 mm to 0.6 mm. An upper portion of the resinlayer 220 may extend to an upper portion of the light emitting device105 to protect the upper portion of the light emitting device 105.

The thickness Zb of the resin layer 220 may be an interval between thethird surface S3 and the fourth surface S4 of the resin layer 220. Thethickness Zb of the resin layer 220 may be a vertical distance betweenthe first and second reflective layers 230 and 240. The thickness Zb maybe equal to a distance between the first and second reflective layers230 and 240. The thickness Zb may be smaller than a distance between thefirst surface S1 and the second surface S2. For example, the distancebetween the first surface S1 and the second surface S2 may include themaximum length Y1 or the minimum length Y2. The maximum length Y2 in thefirst direction Y may be a linear distance between the high point of thefirst convex portion P1 and the second surface S2. A distance or aninterval between the fifth and sixth surfaces S5 and S6 of the resinlayer 220 may be greater than a distance between the apex of the firstconvex portion P1 and the second surface S2. The minimum length Y2 inthe first direction Y may be a linear distance between the second exitsurface S12 and the second surface S2. The distance or interval betweenthe first reflective layer 230 and the second reflective layer 240 maybe smaller than the distance or interval between the first surface S1and the second surface S2 of the resin layer 220. By arranging thedistance between the first and second reflective layers 230 and 240 tobe smaller than the length or minimum width in the first direction Y ofthe lighting device 200, a line-shaped surface light source may beprovided, the luminous intensity may be improved and hot spots may beprevented. In addition, the lighting device may be provided with aflexible characteristic that may be convex or concave in the thirddirection Z. The thickness Zb of the resin layer 220 may be less thantwice the thickness of the light emitting device 105, for example, morethan 1 to 2 times or less than the thickness of the light emittingdevice 105. The thickness Zb of the resin layer 220 may be 2 mm or less,for example, in the range of 1.5 mm to 1.9 mm or in the range of 1.6 mmto 1.8 mm. The thickness Zb of the resin layer 220 may be 0.8 times orless of the thickness Z1 of the lighting device 200, for example, in arange of 0.4 times to 0.8 times the thickness Z1 of the lighting device200. Since the resin layer 220 is disposed with a difference of 1.2 mmor less from the thickness Z1 of the lighting device 200, it is possibleto prevent a decrease in light efficiency in the lighting device 200 andto strengthen the ductility characteristics. A thickness Zb of the resinlayer 220 may be smaller than a length or a maximum length in the seconddirection X of the second light emitting device 103. The thickness Zb ofthe resin layer 220 may be smaller than the maximum length W1 of thefirst exit surface S11 in the second direction X. The thickness Zb ofthe resin layer 220 may be equal to or smaller than the maximum lengthof the second exit surface S12 in the second direction X. That is, byproviding the thickness Zb of the slim resin layer 220, a line-shapedsurface light source may be provided through the first surface S1 in onedirection.

The resin layer 220 may include a resin material such as silicone,silicone molding compound (SMC), epoxy, or epoxy molding compound (EMC).The resin layer 220 may include a UV (ultraviolet) curable resin or athermosetting resin material, for example, may selectively include PC,OPS, PMMA, PVC, and the like. For example, as a main material of theresin layer 420, a resin material containing urethane acrylate oligomeras a main material may be used. For example, the main material may beused a mixture of a synthetic oligomer, urethane acrylate oligomer, anda polyacrylic polymer type. Of course, it may further include a monomerin which a low-boiling-point dilution-type reactive monomer such as1130A (isobornyl acrylate), HPA (Hydroxylpropyl acrylate, 2-HEA(2-hydroxyethyl acrylate), etc.) may be further included, and as anadditive, a photoinitiator (for example, 1-hydroxycyclohexylphenyl-ketone, Diphenyl) or an antioxidant or the like may be mixed.

A bead (not shown) may be included in the resin layer 220, and the beadmay diffuse and reflect incident light, thereby increasing the amount oflight. The resin layer 220 may include a phosphor. The phosphor mayinclude at least one of a yellow phosphor, a green phosphor, a bluephosphor, and a red phosphor.

A region in the resin layer 220 in which the first convex portion P1 isformed may serve as a lens portion. The lens portion of the resin layer220 is provided in a lens shape having a first convex surface, and mayinclude a hemispherical shape, a semicircular shape, a semi-ellipticalshape, or an aspherical shape when viewed from a top view. The lens mayinclude a collimator lens. The lens portion may be further spaced apartfrom the first light emitting device 101 by an apex corresponding to thecenter of the light emitting device 105. The thickness of the lensportion in the third direction Z may be the thickness of the resin layer220. Since the lens portion has flat upper and lower surfaces and acurved surface in a direction of the first surface S1, it is possible todiffuse light incident in a direction of the first surface S1. The lensportion may be disposed between the first and second flat reflectivelayers 230 and 240 on the upper and lower portions, and may refractlight to the first surface S1 and emit the light. The lens portion mayrefract light incident to a region deviating from the optical axis withrespect to the optical axis at an exit angle greater than an incidenceangle. When the lighting device 200 has a curve due to its ductility,the resin layer 220 and the first and second reflective layers 230 and240 may include curved regions instead of being flat. Each of the firstexit surfaces S11 of the resin layer 220 may emit light emitted fromeach of the first light emitting devices 101. Each of the second exitsurfaces S12 disposed between the first exit surfaces S11 of the resinlayer 220 may emit light emitted from each of the second light emittingdevices 103. That is, a dark portion may be existed in a region betweenthe second exit surface S12 and the second light emitting device 103 andthe first exit surface S11, and a difference between a luminousintensity of the light emitted through the first exit surface S11 and aluminous intensity of the light emitted through the second exit surfaceS12 may be reduced. Accordingly, it is possible to reduce or eliminatethe occurrence of dark portions on the second exit surface S12.

The recess portion C1 disposed between the first convex portions P1 inthe resin layer 220 may be provided as a recess recessed in thedirection of the second surface S2. The recessed portion C1 of the resinlayer 220 may be formed on the second exit surface S12 of the resinlayer 220. Since the light emitted from the second light emitting device103 is emitted from the region between the first convex portions P1through the recess portion C1, it is possible to reduce the occurrenceof dark portions in the recess portion C1. Here, when the first convexportion P1 and the recessed portion C1 are disposed on the resin layer220, a shape of the one side direction of the substrate 210 and thefirst and second reflective layers 230 and 240 may be provided in ashape corresponding to the first convex portion P1 and the recessedportion C1. The number of the first convex portions P1 or the lensportions of the resin layer 220 may be the same as the number of thefirst light emitting devices 101. The number of the recesses C1 may bethe same as the number of the second light emitting devices 103.

The first reflective layer 230 may reflect the light emitted from thelight emitting device 105. The first reflective layer 230 may be formedon the upper surface of the substrate 210. The first reflective layer230 may be formed as an upper layer of the substrate 210 or as aseparate layer. The first reflective layer 230 may be adhered to theupper surface of the substrate 210 with an adhesive. The resin layer 220may be adhered to the upper surface of the first reflective layer 230.The first reflective layer 230 has a plurality of holes 232 in a regioncorresponding to the lower surface of the light emitting device 105, andthe light emitting device 105 may be connected to the substrate 210through the holes 232. A portion of the resin layer 220 may be incontact with the substrate 210 through the hole 232. The hole 232 may bea region in which the light emitting device 105 is bonded to thesubstrate 210. The first reflective layer 230 may have a single-layer ormulti-layer structure. The first reflective layer 230 may include amaterial that reflects light, for example, a metal or a non-metalmaterial. When the first reflective layer 230 is a metal, it may includea metal layer such as stainless steel, aluminum (Al), or silver (Ag),and in the case of a non-metallic material, it may include a white resinmaterial or a plastic material. The first reflective layer 230 mayinclude a white resin material or a polyester (PET) material. The firstreflection layer 230 may include at least one of a low reflection film,a high reflection film, a diffuse reflection film, and a regularreflection film. The first reflective layer 230 may be provided, forexample, as a specular reflective film for reflecting incident light tothe first surface S1.

As shown in FIG. 4 , the thickness Zc of the first reflective layer 230may be smaller than the thickness Za of the substrate 210. The thicknessZc of the first reflective layer 230 may be 0.5 times or more and lessthan 1 times the thickness Za of the substrate 210 to reducetransmission loss of incident light. The thickness Zc of the firstreflective layer 230 may be in the range of 0.2 mm to 0.4 mm, and whenit is smaller than the above range, light transmission loss may occur,and when it is thicker than the above range, the thickness Zc of thelighting device 200 Z1 may increase. The second reflective layer 240 maybe disposed on the entire region of the fourth surface S4 of the resinlayer 220 to reduce light loss.

The second reflective layer 240 may be made of the same material as thefirst reflective layer 230. In order to reflect light and reducetransmission loss of light, the second reflective layer 240 may be madeof a material having a higher light reflectance than that of the firstreflective layer 230 or may have a thicker thickness. The secondreflective layer 240 may have a thickness equal to or greater than thethickness Zc of the first reflective layer 230. For example, the firstand second reflective layers 230 and 240 may be provided with the samematerial and the same thickness. The thickness Zd of the secondreflective layer 240 may be equal to or smaller than the thickness Za ofthe substrate 210. The thickness Zd of the second reflective layer 240is at least 0.5 times the thickness Za of the substrate 210, forexample, in the range of 0.5 times to 1 time to reduce transmission lossof incident light. The thickness Zd of the second reflective layer 240may be in the range of 0.2 mm to 0.4 mm, and when it is smaller than theabove range, light transmission loss may occur, and when it is thickerthan the above range, the thickness of the lighting device 200 Z1 mayincrease.

The second reflective layer 240 may be formed in a single-layer ormulti-layer structure. The second reflective layer 240 may include amaterial that reflects light, for example, a metal or a non-metalmaterial. When the second reflective layer 240 is a metal, it mayinclude a metal layer such as stainless steel, aluminum (Al), or silver(Ag), and in the case of a non-metallic material, it may include a whiteresin material or a plastic material. The second reflective layer 240may include a white resin material or a polyester (PET) material. Thesecond reflection layer 240 may include at least one of a low reflectionfilm, a high reflection film, a diffuse reflection film, and a regularreflection film. The second reflective layer 240 may be provided as aspecular reflective film so that, for example, incident light travels inthe direction of the first surface S1. The first and second reflectivelayers 230 and 240 may be made of the same material or differentmaterials.

The laminated structure of the substrate 210, the first reflective layer230, the resin layer 220, and the second reflective layer 240 may have astructure of the first convex portion P1 and the recessed portion C1 inone direction. The first convex portion P1 may have a flat upper surfaceand a flat lower surface, and may include a curved surface or ahemispherical shape in the first direction Y. The recess portion C1 mayinclude a flat or convex curved surface in the direction of the secondsurface S2. At least one or both of the first and second exit surfacesS11 and S12 of the resin layer 220 may be treated as a haze surface,thereby diffusing light. The haze surface may be treated as a surfacerougher than the inner surface of the resin layer 220 to diffuse theemitted light.

As shown in FIGS. 1 and 22 , the luminance distribution of the lightemitted through the second exit surface S12 of the resin layer 220 inthe lighting device 200 may be irradiated to 70% or more, for example,75% or more based on the luminance distribution of the light emittedthrough the first exit surface S11. Accordingly, the difference betweenthe luminance distribution of the light emitted to the first exitsurface S11 and the luminance distribution of the light emitted throughthe second exit surface S12 may be 30% or less, and thus the darkportion may not be recognized on the external image. The uniformity ofthe total light of such a lighting device may be improved to 80% ormore.

Meanwhile, the plurality of first light emitting devices 101 may bearranged in a direction from the fifth surface S5 to the sixth surfaceS6 of the resin layer 220. The plurality of second light emittingdevices 103 may be arranged in a direction from the fifth surface S5 tothe sixth surface S6 of the resin layer 220. In a region between thefirst and second surfaces S1 and S2, the first and second light emittingdevices 101 and 103 may be arranged in different rows. The first lightemitting device 101 may be disposed closer to the first surface S1 thanthe second light emitting device 103. The second light emitting device103 may be disposed closer to the second surface S2 than the first lightemitting device 101.

The first surface S1 and the second surface S2 may have the same heightor thickness in a vertical direction. As another example, the height orthickness of the first surface S1 and the second surface S2 may bedifferent from each other, for example, the thickness of the firstsurface S1 may be greater than the thickness of the second surface S2.Each of the surfaces S1, S2, S5, and S6 of the lighting device 200 maybe each side of the resin layer 220 having the thickest thickness in thelighting device 200.

The first or second light emitting devices 101 and 103 may be arrangedon a straight line extending in the second direction X. The first orsecond light emitting devices 101 and 103 may be arranged on a virtualcurve having a curvature or an inclined oblique line with respect to thesecond direction X.

The plurality of light emitting devices 105 (101, 103) may face thefirst surface S1. The emission portions 111 and 113 of the plurality oflight emitting devices 105 (101, 103) may face the first surface S1. Thelight emitted from the light emitting device 105 is emitted through thefirst surface S1, and some light may be emitted through at least one ofthe second surface S2, the fifth surface S5, and the sixth surface S6.That is, most of the light emitted from the light emitting device 105may be emitted through the first surface S1.

The first exit surface S11 may protrude more than a straight lineconnecting one end of the third and fourth surfaces S3 and S4. Theconvex shape of the first exit surface S11 may be a hemispherical shape,a shape having a curved surface, a semicircle, a semi-elliptical shape,or an aspherical shape. The first exit surface S11 may protrude from thefirst light emitting device 101 in the first direction Y or in adirection of the first surface S1, and a protruding shape is a firstprotrusion portion P1 and have a hemispherical, curved or non-sphericalshape. The second exit surface S12 may be disposed between the firstexit surfaces S11, respectively. Each of the second exit surfaces S12may be connected between lower ends of the adjacent first exit surfacesS11. The second exit surface S12 may extend horizontally or flatlybetween lower ends of the adjacent first exit surfaces S11. A boundaryportion between the first and second exit surfaces S11 and S12 may be anangled surface, a curved surface, or a rounded surface. A thickness in avertical direction of the first exit surface S11 may be the same as athickness in a vertical direction of the second exit surface S12.

Referring to FIGS. 7 and 8 , the first exit surface S11 may includefirst and second points Pa and Pb closest to the first light emittingdevice 101, and a third point Pc having a maximum distance from thefirst light emitting device 101, wherein the first and second points Paand Pb may be both ends of the first exit surface S11, and the thirdpoint Pc may be a center point of the first exit surface S11. Themaximum length W1 between the first and second points Pa and Pb may bethe maximum length of the first exit surface S11 in the second directionX or the maximum length of the first convex portion P1. The first exitsurface S11 may be provided as a convex curved surface from the firstand second points Pa and Pb toward the third point Pc. The first andsecond points Pa and Pb may be disposed at symmetrical positions withrespect to the third point Pc or may be spaced apart from each other bythe same distance.

The second exit surface S12 may include both points disposed at bothends, and the both points may be a boundary point between the first andsecond points Pa and Pb or a portion recessed toward the second lightemitting device 103. The length W2 in the second direction X of thesecond exit surface S12 is the maximum length, and may be smaller thanthe maximum length W1 of the first exit surface S11. The length W2 maybe 0.5 times or less, for example, in a range of 0.1 times to 0.5 timesthe length W1. When the length W2 is greater than the above range, theremay be a problem in that the light emitted through the first exitsurface S11, which is the main light, is affected or the length W1 ofthe first exit surface S11 is reduced, when it is smaller than the aboverange, the amount of light may be reduced, and thus the improvement ofthe dark portion may be insignificant.

The first exit surface S11 may overlap each of the first light emittingdevices 101 in the first direction Y. The second exit surface S12 mayoverlap each of the second light emitting devices 103 in the firstdirection Y. The outer end of the second light emitting device 103, thatis, both ends in the second direction X may overlap the first exitsurface S11 in the first direction Y. That is, the maximum length W1 ofthe first exit surface S11 in the second direction X may be greater thanthe maximum length of the first light emitting device 101. The maximumlength W2 of the second exit surface S12 in the second direction X maybe equal to or greater than the maximum length of the second lightemitting device 103. The length W2 may be 6 mm or less, for example, inthe range of 1 mm to 6 mm. That is, since the maximum length W2 in thesecond direction X of the second exit surface S12 is provided to berelatively smaller than the maximum length W1 in the second direction Xof the first exit surface S11, the luminous intensity of the lightemitted through the second exit surface S12 may be improved withoutaffecting the luminous intensity of the first exit surface S11.

As shown in FIG. 7 , the maximum distance D2 between the first lightemitting device 101 and the first surface S1 and the distance D4 betweenthe second light emitting device 103 and the second surface S2 may bedifferent from each other. The distance D4 between the second lightemitting device 103 and the second surface S2 may be 2 mm or more, forexample, may be in the range of 2 mm to 20 mm. When the distance D4between the second light emitting device 103 and the second surface S2is smaller than the above range, the region where moisture may penetrateor form a circuit pattern may be reduced, when it is larger the aboverange, the size of the device 200 may be increased. The maximum distanceD2 is the maximum distance between the first light emitting device 101and the first exit surface S11, and may be 5 mm or more, for example, ina range of 5 mm to 20 mm or 8 mm to 20 mm. When the maximum distance D2is smaller than the above range, a hot spot may be generated, and whenit is larger than the above range, the module size may be increased.

The maximum distance D2 may be a maximum distance between the firstlight emitting device 101 and the first exit surface S11 or a lineardistance between the apex of the first convex portion P1. The lineardistance D5 between the second light emitting device 103 and the secondexit surface S13 may be 5 mm or more, for example, in the range of 5 mmto 20 mm or in the range of 8 mm to 20 mm. When the linear distance D5is smaller than the above range, a hot spot may be generated. Themaximum distance D2 may be equal to or greater than the distance D5. Thedistance D3 between the straight line connecting the at least two firstlight emitting devices 101 and the straight line connecting the at leasttwo second light emitting devices 103 may be provided with a size inwhich a circuit pattern can be formed, and may be provided in a range of0.5 mm or more, for example, in a range of 0.5 mm to 4 mm. The distanceD1 between the straight line connecting the second exit surfaces S13 andthe first light emitting device 101 may be 5 mm or more, for example, ina range of 5 mm to 12 mm, and when the distance D1 is smaller than theabove range, a depth H1 of the recess portion C1 may be increased or themaximum distance D2 between the first light emitting device 101 and thefirst convex portion P1 may be narrowed. Thus, a dark portion may begenerated in the recess portion C1. The distance D1 may vary dependingon the angle of beam spread of the first light emitting device 101. Thatis, when the distance between the straight line connecting both ends ofthe first convex portion P1 and the first light emitting device 101 istoo close, the light may be condensed to the center region of the firstexit surface S11, when it is too far away, light may be irradiated tothe second exit surface S12, so that the luminous intensity through thefirst exit surface S11 may be reduced.

Here, when the first convex portion P1 has a lens shape, a relationshipof (n−1)×(1−R)=1/f is satisfied, R=(n−1)f, and R may be proportional tof (D2 or D5). The R may be a radius of curvature Rf of the first convexportion P1, the f may be a focal length, and the n may be a refractiveindex. The refractive index is a refractive index of a material of theresin layer, and may be 1.6 or less, for example, in a range of 1.4 to1.6. Here, the angle of beam spread is an angle of beam spread of thefirst light emitting device 101, and may be in the range of 115 degreesor more, for example, in a range of 115 degrees to 135 degrees. Theradius of curvature Rr of the first convex portion P1 may be formed inconsideration of the distribution of the angle of beam spread of thefirst light emitting device 101. Here, when the interval between thefirst convex portions P1 is the same, the interval between the firstlight emitting devices 101 may be the same. Here, a portion of the firstlight emitting device 101 may be disposed in the first virtual circle Q4passing through the first convex portion P1. The first virtual circle Q4may have a diameter equal to or greater than the maximum length W1 ofthe first convex portion P1 or the first exit surface S11. The virtualfirst circle Q4 may pass through at least two of the points Pa, Pb, andPc of the first convex portion P1 or the first exit surface S11 based onthe center Pr of the circle, and may be a circle having a radius Rr. Thefirst emission portion 111 of the first light emitting device 101 may bedisposed within a region of the first virtual circle Q4. The diameter ofthe first virtual circle Q4 may be greater than the maximum length D2.The diameter of the first virtual circle Q4 forming the first convexportion P1 may be equal to or greater than the maximum length W1 of thefirst exit surface S11 in the second direction X or the first convexportion P1.

Referring to FIG. 8 , an angle Q1 formed by both points Pa and Pb of thefirst exit surface S11 with respect to the center of the first emissionportion 111 of the first light emitting device 101 may be 115 degrees ormore, for example, in the range of 115 to 135 degrees, and may beprovided in consideration of the angle of beam spread. The angle Q2formed by both ends of the second exit surface S12 with respect to thecenter of the second emission portion 113 of the second light emittingdevice 103 may be 30 degrees or less, for example, in the range of 2degrees to 30 degrees. Accordingly, the light emitted through the secondlight emitting device 103 may be condensed through the second exitsurface 103 and may be effectively emitted. As shown in FIG. 22 , adifference between the luminous intensity emitted to the first exitsurface S11 and the luminous intensity emitted to the second exitsurface S12 may be 30% or less, for example, in the range of 5% to 30%.The angle Q3 between the straight lines passing the center of theadjacent second light emitting devices 103 from the first light emittingdevice 101 as a starting point may be 90 degrees or more, for example,in a range of 90 degrees to 150 degrees. The first central axis Yapassing through the center of the first convex portion P1 or the centerof the virtual circle Q4 and the center of the first light emittingdevice 101 may be parallel to or may converge toward an randomly focalpoint with respect to the second central axis Yb passing through thecenter of the second exit surface 113 and the center of the second lightemitting device 103.

FIGS. 9 to 11 are modified examples of a lighting device according to anembodiment of the invention. The modified example may selectivelyinclude the configuration, description, or drawings of the embodimentsdisclosed above, and detailed descriptions thereof will be omitted.

In the description of the lighting device of FIGS. 9 to 11 , as shown inFIGS. 3 to 6 , the lighting device includes a substrate 210, a resinlayer 220 and a second reflective layer 240, and first and second lightemitting devices 101 and 103. In the lighting device, a first reflectivelayer 230 may be disposed between the substrate 210 and the resin layer220. The detailed configuration of the substrate 210, the resin layer220, the first and second reflective layers 230 and 240, and the firstand second light emitting devices 101 and 103 may be selectivelyincluded with reference to the description of the embodiments disclosedabove.

As shown in FIGS. 9 and 10 , the first surface S1 of the resin layer 220may include a first exit surface S11 and a second exit surface S13. Thefirst exit surface S11 may include a first convex portion P1 protrudingfrom the second exit surface S13 toward the first surface S1. The secondexit surface S13 may protrude from both ends of the first exit surfaceS11 in the direction of the first surface. The first exit surface S11may include a first convex portion P1. The second exit surface S13 mayinclude a second convex portion P2. The first exit surface S1 mayinclude a first convex surface, and the second exit surface S13 mayinclude a second convex surface. The first exit surface S11, the firstconvex portion P1, or the first convex surface may be disposed at aposition facing to the first light emitting device 101. The second exitsurface S13, the second convex portion P2, or the second convex surfacemay be disposed at a position facing to the second light emitting device103. Each of the plurality of first light emitting devices 101 mayoverlap the first exit surface S11, the first convex portion P1, or thefirst convex surface in the first direction Y. Each of the plurality ofsecond light emitting devices 103 may overlap the second exit surfaceS13, the second convex portion P2, or the second convex surface in thefirst direction Y. The first convex portion P1 may have a firstcurvature, and the second convex portion P2 may have a second curvature,and the size of the second curvature may be different from the size ofthe first curvature, for example, and may be larger than the size of thefirst curvature. That is, the second radius of curvature of a circlehaving the second curvature may be smaller than the first radius ofcurvature of a circle having the first curvature. That is, the value ofthe curvature is the reciprocal of the radius of the curvature.

The maximum length Y1 from the second surface S2 of the resin layer 220to the first convex portion P1 or the first exit surface S11 may begreater than the minimum length Y2 from the second surface S2 to thesecond convex portion P2 or the second exit surface S13. The maximumdistance D5 from the second convex portion P2 or the second exit surfaceS13 to the second light emitting device 103 may be the same as themaximum distance D2 from the first convex portion P1 or the first exitsurface S11 to the first light emitting device 101, or may have adifference of ±5% based on the distance D2. The maximum distance D5 mayvary according to the second curvature of the second convex portion P2.

The apex of the second convex portion P2 may be formed to have a depthH2 smaller than the height H1 of the first convex portion P1 from theapex of the first convex portion P1. For example, the depth H2 may be0.5 or less of the height H1. The first convex portion P1 or the firstconvex surface may include a hemispherical shape, a semi-circle orsemi-elliptical shape, an aspherical shape, or a shape having a curvedsurface. The second convex portion P2 or the second convex surface mayinclude a hemispherical shape, a semi-circular or semi-elliptical shape,an aspherical shape, or a shape having a curved surface. Here, when thefirst and second convex portions P1 and P2 have a lens shape, the focallength f may be obtained as follows. To explain at the focal length f,it has a relationship of 1/f=(n−1)×(1/R1−1/R2), the R1 is a radius ofcurvature of the first convex portion P1, and the R2 is a radius ofcurvature of the second convex portion P2, and the n may be therefractive index of a material of the resin layer. The radius ofcurvature of the first and second convex portions P1 and P2 isproportional to f (D2 or D5), and may be considered with thehalf-maximum angle of each light emitting. The D2 is the maximumdistance between the first convex portion and the first light emittingdevice, and the D5 is the maximum distance between the second convexportion and the second light emitting device. Here, the radius ofcurvature of the second convex portion P2 may be smaller than the radiusof curvature of the first convex portion P1.

The area of the upper surface or the lower surface of the first convexportion P1 may be at least twice the area of the upper surface or thelower surface of the second convex portion P2, for example, in the rangeof 2 times to 10 times. The maximum length W1 of the first convexportion P1 in the second direction X may be greater than the maximumlength W2 of the second convex portion P2, for example, the length W2may be 0.5 times or less, or in the range of 0.5 times to 0.1 times thelength W1. The maximum length W2 of the second exit surface S13 in thesecond direction X may be equal to or greater than the maximum length ofthe second light emitting device 103. The length W2 may be 6 mm or less,for example, in the range of 1 mm to 6 mm. That is, since the maximumlength W2 in the second direction X of the second exit surface S13 isprovided to be relatively smaller than the maximum length W1 in thesecond direction X of the first exit surface S11, the luminous intensityof the light emitted through the second exit surface S13 may be improvedwithout affecting the luminous intensity of the first exit surface S11.

A first radius of curvature of the first exit surface S11 or the firstconvex surface may be different from a second radius of curvature of thesecond exit surface S13 or the second convex surface. The second radiusof curvature may be greater than the first radius of curvature, forexample, 0.5 times or less, or in a range of 0.5 times to 0.1 times thefirst radius of curvature. The first curvature of the first convexsurface and the second curvature of the second convex surface may bedifferent from each other, and the second curvature may be greater thanor equal to twice the first curvature. Each of the second convex surfaceor the second convex portion P2 may be disposed between the first convexsurface or the first convex portion P1, respectively.

As shown in FIG. 11 , a virtual first circle Q4 passing through thefirst and second points Pa, Pb and/or the third point Pc of the firstconvex portion P1, the first convex surface or the first emissionsurface S11 may overlap the first light emitting device 101. The firstand second points Pa and Pb may be disposed at positions symmetrical toeach other with respect to the third point Pc or may be spaced apartfrom each other by the same distance. A virtual second circle Q5 passingthrough at least two of the fourth, fourth, and fifth points Pd and Peand the sixth point Pf of the second convex portion P2, the secondconvex surface or the second exit surface S13 may be spaced apart fromthe second light emitting device 103 without overlapping. The fourth andfifth points Pd and Pe may be disposed at positions symmetrical to eachother with respect to the sixth point Pf or may be spaced apart fromeach other by the same distance. The fourth and fifth points Pd and Pemay be a boundary point between the second convex part P2 and the firstconvex part P1, or may be both ends of the second direction X of thesecond emitting surface S13. The sixth point Pf may be a center point oran apex of the second convex portion P2. Here, a portion of the firstlight emitting device 101 may be disposed in the first virtual circle Q4passing through the first convex portion P1. The first virtual circle Q4may have a diameter equal to or greater than the maximum length W1 ofthe first convex portion P1 or the first emission surface S11. The firstvirtual circle Q4 may pass through at least two of the points Pa, Pb,and Pc of the first convex portion P1 or the first emission surface S11with respect to the center and may be a circle having radius Rr. Thefirst emission portion 111 of the first light emitting device 101 may bedisposed in the region of the first virtual circle Q4. A diameter of thefirst virtual circle Q4 may be greater than the maximum length D2. Thediameter of the first imaginary circle Q4 constituting the first convexportion P1 may be equal to or greater than the maximum length W1 in thesecond direction X of the first convex portion P1 or the first exitsurface S11. The first central axis Ya passing through the center of thefirst convex portion P1 or the center of the virtual circle Q4 and thecenter of the first light emitting device 101 may be parallel to thesecond central axis Yb passing through the center of the second exitsurface 113 and the center of the second light emitting device 103, orconverged toward a randomly focal point.

As shown in FIGS. 9 and 23 , the luminance distribution of the lightemitted through the convex second exit surface S13 from the resin layer220 in the lighting device may be irradiated with 80% or more, forexample, 85% or more based on the luminance distribution of the lightemitted through the convex first exit surface S11. Accordingly, thedifference between the luminance distribution of the light emitted tothe first exit surface S11 and the luminance distribution of the lightemitted through the second exit surface S13 may be 20% or less or 15% orless, so that the dark portion on the external image may be notrecognized. The uniformity of the total light of such a lighting devicemay be improved to 90% or more.

In the above embodiment, the second light emitting device 103 or thesecond row in which they are arranged may be disposed to be more spacedapart from the second light exit surface S12 and S13 than the firstlight emitting device 101. As another example, referring to FIG. 12 ,the second light emitting device 104 may be disposed closer to thesecond exit surface S12 than the first light emitting device 101. Thatis, since the area of the second exit surface S12 is smaller than thatof the first exit surface S11, by disposing the second light emittingdevice 104 closer to the second exit surface S12, the luminancedistribution emitted through the second exit surface S12 may be furtherimproved. The distance D6 between the second light exit surface S12 andthe second light emitting device 104 may be 3 mm or more and may besmaller than the minimum distance between the first light emittingdevice 101 and the second light exit surface S12.

Referring to FIG. 13 , the second light emitting device 104 may bedisposed closer to the second exit surface S13 than the first lightemitting device 101. That is, since the area of the second exit surfaceS13 is smaller than that of the first exit surface S11, by disposing thesecond light emitting device 104 closer to the second exit surface S13,the luminance distribution emitted through the second exit surface S13may be further improved. The distance D7 between the second light exitsurface S13 and the second light emitting device 104 may be 3 mm or moreand may be smaller than the minimum distance between the first lightemitting device 101 and the second light exit surface S13.

As shown in FIGS. 12 and 13 , since the position of the second lightemitting device 104 facing the second exit surfaces S12 and S13 aredisposed closer than the distance D1 between the first emission surfaceS11 and the first light emitting device 101 in consideration of the areaof the second exit surfaces S12 and S13, the luminance distribution ofthe light emitted through the second exit surfaces S12 and S13 may beincreased.

Referring to FIG. 14 , at least one or two or more of the first lightemitting devices 101, 101A and 101B in the first row in the lightingdevice may be tilted or disposed to be inclined as the distance from thefifth surface S5 increases. The center of the tilted light emittingdevices 101A and 101B is tilted from the center of each of the convexportions P1 a and P1 b or the central axis Y1 a passing through thecenter of a circle formed by each of the convex portions P1 a and P1 b,and may be converged to the central axis Ya and the focal length. Thestraight line Xa connecting the apexes of the first convex portions P1 aand P1 b facing to the tilted first light emitting devices 101A and 101Bis not tilted, or may have a tilted or inclined angle Q7 toward thesecond surface rather than a straight line X0 extending in the seconddirection X based on the apex of the first convex portion P1 facing tothe first light emitting device 101 adjacent to the fifth surface S5.The second light emitting devices 103A and 103B disposed between thetilted first light emitting devices 101A and 101B or in a direction awayfrom the fifth surface S5 may be disposed to be tilted. The tilted firstlight emitting devices 101A and 101B and the second light emittingdevices 103A and 103B may be tilted at the same angle or at differentangles. Such a lighting device arranges at least one or two or moretilted light emitting devices in the first row and/or second row in theresin layer, so that the light emitting devices are arranged in adirection in which the distribution of the angle of beam spread may beconverged.

FIG. 15 is another example of the lighting device of the invention. Asshown in FIG. 15 , the first reflective layer 230 may be spaced apartfrom the edge of the substrate 210, and a portion 222 of the resin layer220 may be in contact with an edge-side upper surface of the substrate210. When the resin layer 220 is in contact with the edge of thesubstrate 210, moisture penetration may be suppressed. As anotherexample, in the lighting device shown in FIGS. 2 and 15 , a thirdreflective layer 245 may be further disposed on surfaces S2, S3, and S4of the resin layer 220 except for the first surface S1. The thirdreflective layer 245 may prevent light leakage and increase the amountof light extracted to the first surface S1. The third reflective layer245 may be made of the above-described first and second reflectivelayers 230 and 240. The third reflective layer 245 may be in contactwith or spaced apart from the side surface of the resin layer 220.

As shown in FIG. 16 , the lighting device according to the embodimentmay be convexly curved in the down direction or the substrate direction,or convexly curved in the up direction or the second reflective layerdirection, as it approaches the center region with respect to the fifthand sixth surfaces S5 and S6. As shown in FIG. 17 , the lighting deviceaccording to the embodiment may include a convex region convex in an updirection or a second reflection layer direction from the fifth surfaceS5 to the sixth surface S6, and at least one concave region in a downdirection or a substrate direction between the convex regions or theconvex region and adjacent region. The convex region and the concaveregion may be alternately arranged with each other.

In the embodiment of the invention, when the thickness of the resinlayer 220 is provided to be thick, for example, in a range of 3 mm to 6mm, the light emitting area is increased due to the increase in thethickness of the resin layer 220, so that the light distribution may beimproved. The lighting device according to an embodiment of theinvention may be applied to a lamp as shown in FIG. 18 . The lamp is anexample of a vehicle lamp, and is applicable to a head lamp, a sidelamp, a side mirror lamp, a fog lamp, a tail lamp, a brake lamp, adaytime running lamp, a vehicle interior lighting, a door scar, a rearcombination lamp, or backup lamps.

Referring to FIG. 18 , the lighting device 200 having the first andsecond light emitting devices 101 and 103 described above may be coupledto the lamp inside a housing 503 having an inner lens 502. The thicknessof the lighting device 200 is such that it may be inserted into theinner width of the housing 503. The width Z3 of the emission portion 515of the inner lens 502 may be equal to or equal to or less than twice thethickness of the lighting device 200, thereby preventing a decrease inluminous intensity. The inner lens 502 may be spaced apart from thefront surface of the lighting device 200 by a predetermined distance,for example, 10 mm or more. An outer lens 501 may be disposed on theemission side of the inner lens 502. The lamp having the lighting device200 is an example, and may be applied to other lamps in a flexiblestructure, for example, a curved surface or a curved structure whenviewed from the side.

FIG. 19 is a plan view showing an example of a light emitting deviceapplied to a lighting device according to an embodiment of theinvention, FIG. 20 is FIG. 19 is an example of a device in which thelight emitting device is disposed on a substrate, and FIG. 21 is a viewof the device of FIG. 20 viewed from the other side

Referring to FIGS. 19 to 21 , the light emitting device 100 includes abody 10 having a cavity 20, a plurality of lead frames 30 and 40 in thecavity 20, and one or a plurality of light emitting chips 71 disposed onat least one of the plurality of lead frames 30 and 40. The lightemitting device 100 is an example of the light emitting device disclosedin the above embodiment and may be implemented as a side-view type lightemitting package. The light emitting device 100 may have a length in thesecond direction of three times or more, for example, four times or morethan the width of the first direction. The length of the first directionmay be 2.5 mm or more, for example, in a range of 2.7 mm to 6 mm. Thelight emitting device 100 may provide a long length in the seconddirection, thereby reducing the number of light emitting devices 100 inthe second direction. The light emitting device 100 may provide arelatively thin thickness, thereby reducing the thickness of thelighting module having the light emitting device 100. The thickness ofthe light emitting device 100 may be 2 mm or less. The body 10 isprovided with the cavity 20 and the length of the body 10 in the firstdirection may be three times or more compared to the thickness T1 of thebody 10, thereby widening the angle of beam spread of light in thesecond direction. The lead frames 30 and 40 are disposed on the bottomof the cavity 20 of the body 10. For example, a first lead frame 30 anda second lead frame 40 are coupled to the body 10. The body 10 may beformed of an insulating material. The body 10 may be formed of areflective material. The body 10 may be formed of a material having areflectance higher than a transmittance with respect to a wavelengthemitted from the light emitting chip 71, for example, a material havinga reflectance of 70% or more. In the case in which the reflectance is70% or more, the body 10 may be defined as a non-transparent material ora reflective material. The body 10 may be formed of a resin-basedinsulating material, for example, a resin material such asPolyphthalamide (PPA). The body 10 may be formed of a thermosettingresin including a silicone-based, epoxy-based, or plastic material, or amaterial having high heat resistance and high light resistance. The body10 includes a reflective material, for example, a resin material towhich a metal oxide is added, and the oxide may include at least one ofTiO₂, SiO₂, and Al₂O₃. Such a body 10 may effectively reflect incidentlight. As another example, the body 10 may be formed of a resin materialhaving a translucent resin material or a phosphor material converting awavelength of incident light. The front portion 15 of the body 10 may bea surface on which the cavity 20 is disposed, or may be a surface onwhich light is emitted. The rear portion of the body 10 may be anopposite side of the front portion 15.

The first lead frame 30 includes a first lead portion 31 disposed at thebottom of the cavity 20, a first bonding portion 32 disposed on a firstouter regions 11A and 11C of the first side portion 11 of the body 10,and a first heat radiating portion 33 disposed on the third side portion13 of the body 10. The first bonding portion 32 is bent from the firstlead portion 31 disposed in the body 10 and protrudes to the first sideportion 11, and the first heat radiating portion 33 may be bent from thefirst bonding portion 32. The first outer regions 11A and 11C of thefirst side portion 11 may be a region adjacent to the third side portion13 of the body 10. The second lead frame 40 includes a second leadportion 41 disposed on the bottom of the cavity 20, a second bondingportion 42 disposed on second outer regions 11B and 11D of the firstside portion 11 of the body 10, and a second heat radiating portion 43disposed on the fourth side portion 14 of the body 10. The secondbonding portion 42 is bent from the second lead portion 41 disposed inthe body 10 and the second heat radiating portion 43 may be bent fromthe second bonding portion 42. The second outer regions 11B and 11D ofthe first side portion 11 may be a region adjacent to the fourth sideportion 14 of the body 10.

A gap portion 17 between the first and second lead portions 31 and 41may be formed of a material of the body 10 and may be the samehorizontal surface with the bottom of the cavity 20 or may protrude, butthe invention is not limited thereto. The first outer regions 11A and11C and the second outer regions 11B and 11D has an inclined regions 11Aand 11B and a flat regions 11C and 11D. The first and second bondingportions 32 and 42 of the first and second lead frames 30 and 40 mayprotrude through the inclined regions 11A and 11B, but the invention isnot limited thereto.

Here, the light emitting chip 71 may be disposed on, for example, thefirst lead portion 31 of the first lead frame 30. The light emittingchip 71 may be connected to the first and second lead parts 31 and 41 bywires 72 and 73, or the light emitting chip 71 may be adhesivelyconnected to the first lead part 31 and connected to the second leadpart 41 by wire. The light emitting chip 71 may be a horizontal chip, avertical chip, or a chip having a via-structure. The light emitting chip71 may be mounted in a flip chip manner. The light emitting chip 71 mayselectively emit light within a wavelength range of an ultraviolet rayto a visible ray. The light emitting chip 71 may emit ultraviolet lightor a blue peak wavelength, for example. The light emitting chip 71 mayinclude at least one of Group II-VI compounds and Group III-V compounds.The light emitting chip 71 may be formed of a compound selected from thegroup consisting of GaN, AlGaN, InGaN, AlInGaN, GaP, AlN, GaAs, AlGaAs,InP and mixtures thereof. The light emitting chip 71 may be disposed inthe cavity 20 in one or more. The plurality of light emitting chips 71may be disposed on at least one of the first lead frame 30 and thesecond lead frame 40.

In an inner side of the cavity 20, first, second, third and fourth innersides 21, 22, 23 and 24 disposed around the cavity 20 may be inclinedwith respect to a horizontal straight line of an upper surface of thelead frames 30 and 40. A first inner side 21 adjacent to the first sideportion 11 and a second inner side 22 adjacent to the second sideportion 12 is inclined at an angle to the bottom of the cavity 20, and athird inner side 23 adjacent to the third side portion 13 and a fourthinner side 24 adjacent to the fourth side portion 14 may be inclined atan angle smaller than the inclination angle of the first and secondinner sides 21 and 22. Accordingly, the first and second inner sides 21and 22 reflect the progress of the incident light toward the first axisdirection Y, and the third and fourth inner sides 23 and 24 may diffusethe incident light in the second axis direction X.

The inner side surfaces 21, 22, 23 and 24 of the cavity 20 may have astepped region vertically stepped from the front side portion 15 of thebody 10. The stepped region may be disposed to be stepped between thefront side portion 15 of the body 10 and the inner sides 21, 22, 23 and24. The stepped region may control the directivity characteristic of thelight emitted through the cavity 20. The light emitting chip 71 disposedin the cavity 20 of the light emitting device 100 according to theembodiment may be arranged in one or a plurality. The light emittingchip 71 may be selected from, for example, a red LED chip, a blue LEDchip, a green LED chip, and a yellow green LED chip.

A molding member 81 is disposed in the cavity 20 of the body 11 as shownin FIG. 42 , and the molding member 81 includes a light-transmittingresin such as silicone or epoxy, and may be formed in a single layer ormultiple layers. A phosphor for changing a wavelength of light emittedon the molding member 81 or the light emitting chip 71 may be included,and the phosphor excites and emits a portion of the light emitted fromthe light emitting chip 71 to obtain a different wavelength. Thephosphor may be selectively formed from quantum dots, YAG, TAG,Silicate, Nitride, and Oxy-nitride-based materials. The phosphor mayinclude at least one of a red phosphor, a yellow phosphor, and a greenphosphor, but is not limited thereto. The surface of the molding member81 may be formed in a flat shape, a concave shape, a convex shape, etc.,but is not limited thereto. As another example, a light-transmittingfilm having a phosphor may be disposed on the cavity 20, but is notlimited thereto.

A lens may be further formed on the upper portion of the body 10, andthe lens may include a concave or convex lens structure, and may controllight distribution of light emitted by the light emitting device 100. Asemiconductor device such as a light receiving device or a protectiondevice may be mounted on the body 10 or any one of the lead frames, andthe protection device may be implemented as a thyristor, a Zener diode,or a TVS (Transient Voltage Suppression), and the Zener diode protectsthe light emitting chip 71 from electrostatic discharge (ESD).

Referring to FIGS. 20 and 21 , at least one or a plurality of lightemitting devices 100 are disposed on a substrate 210, and a firstreflective layer 230 is disposed around a lower portion of the lightemitting devices 100. The light emitting device 100 may be applied tothe lighting module disclosed above as an example of the light emittingdevice disclosed in the embodiment. The first and second lead portions33 and 43 of the light emitting device 100 are bonded to the electrodepatterns 213 and 215 of the substrate 210 with solder or conductivetape, which are conductive adhesive members 217 and 219.

The characteristics, structures and effects described in theabove-described embodiments are included in at least one embodiment butare not limited to one embodiment. Furthermore, the characteristic,structure, and effect illustrated in each embodiment may be combined ormodified for other embodiments by a person skilled in the art. Thus, itwould be construed that contents related to such a combination and sucha modified example are included in the scope of the invention.

An embodiment of the invention may provide a lighting module and alighting device irradiated with line-shaped surface light. An embodimentof the invention may provide a lighting module and a lighting device inwhich a resin layer having a light emitting device is disposed between aplurality of reflective layers. An embodiment of the invention mayprovide a lighting module and a lighting device in which a resin layerhaving a plurality of light emitting devices disposed in different rowsbetween a plurality of reflective layers is disposed. An embodiment ofthe invention may provide a lighting module and a lighting device thatemit light having a predetermined intensity or more through at least oneside surface of a resin layer having a light emitting device. Anembodiment of the invention may provide a lighting module or a lightingdevice that provides a plurality of first convex portions respectivelyfacing to the first light emitting devices as one side surface of theresin layer. An embodiment of the invention may include a flat portionor a second convex portion facing the second light emitting devices,respectively, between the plurality of first convex portions disposed onone side surface of the resin layer. An embodiment of the inventionprovides a lighting module for irradiating a line-shaped side lightsource or a surface light source, and a lighting device having the same.An embodiment of the invention may provide a light unit having alighting module, a liquid crystal display, and a vehicle lamp.

Technical Solution

A lighting device according to an embodiment of the invention includes:a substrate; a plurality of light emitting devices disposed on thesubstrate; a first reflective layer disposed on the substrate; a resinlayer disposed on the first reflective layer; and a second reflectivelayer disposed on the resin layer, wherein the resin layer includes afirst surface from which light emitted from the plurality of lightemitting devices is emitted, and a second surface opposite to the firstsurface, The first surface of the resin layer includes a first exitsurface having a first curvature, and a second exit surface having aflat surface or a second curvature, and the maximum distance from thesecond surface to the first exit surface may greater than the maximumdistance from the second surface to the second exit surface.

A lighting device according to an embodiment of the invention includes:a substrate; a plurality of light emitting devices disposed on thesubstrate; a first reflective layer disposed on the substrate; a resinlayer disposed on the first reflective layer; and a second reflectivelayer disposed on the resin layer, wherein the resin layer includes afirst surface from which light emitted from the plurality of lightemitting devices is emitted, and the plurality of light emitting devicesincludes a first light emitting device disposed in a first row and asecond light emitting device disposed in a second row, wherein the firstsurface of the resin layer has a first convex surface facing to thefirst light emitting device and having a first curvature, and a secondconvex surface facing to the second light emitting device and having asecond curvature, and a size of the first curvature may be differentfrom a size of the second curvature.

A lighting device according to an embodiment of the invention includes:a substrate; a light emitting device including a first light emittingdevice and a second light emitting device disposed on the substrate; afirst reflective layer disposed on the substrate; a resin layer disposedon the first reflective layer; and a second reflective layer disposed onthe resin layer, wherein the resin layer includes a first surface fromwhich light emitted from the first light emitting device and the secondlight emitting device is emitted, wherein the first surface of the resinlayer includes a convex first exit surface and a convex second exitsurface, and the first exit surface and the second exit surface includefirst and second points adjacent to each other, and a third point thatis an apex. The first and second points are symmetrical with respect tothe third point, and the first light emitting device overlaps with avirtual first circle passing at least two of the first, second, andthird points of the first exit surface, and the second light emittingdevice may not overlap with a virtual second circle passing at least twoof the first point, the second point, and the third point.

According to an embodiment of the invention, the radius of curvature ofthe second exit surface may be 0.5 times or less than the radius ofcurvature of the first exit surface. According to an embodiment of theinvention, the first surface is an outer surface of the resin layerbetween the first and second reflective layers in the first direction,and a surface opposite to the first surface in the first direction isthe second surface, wherein a plurality of the first exit surfaces aredisposed, the second exit surfaces are respectively disposed between thefirst exit surfaces, and the plurality of light emitting devicesincludes a plurality of first light emitting devices adjacent to thefirst surface, and the a plurality of second light emitting devicesadjacent to the second surface, wherein the plurality of first lightemitting devices overlap each of the first light exit surfaces in afirst direction, and the plurality of second light emitting devicesincludes the second light emitting devices may overlap each of thesecond exit surfaces in the first direction. The plurality of secondlight emitting devices may be disposed closer to the second surface thanthe first light emitting device, and the plurality of first and secondlight emitting devices may be arranged in different rows. The first andsecond light emitting devices may be disposed not to overlap in thefirst direction, and a length of the second light emitting device in asecond direction orthogonal to the first direction may be smaller than amaximum length of the first exit surface. A length of the second lightemitting device in the second direction orthogonal to the firstdirection may be smaller than a maximum length of the second exitsurface. According to an embodiment of the invention, the maximumdistance from the center of the first light emitting device to the firstexit surface may be equal to or greater than the maximum distance fromthe center of the second light emitting device to the second exitsurface.

According to an embodiment of the invention, the thickness of the resinlayer may be equal to or less than the maximum length of the second exitsurface, and the height of the first surface may be the same as thethickness of the resin layer. The maximum length of the second exitsurface has a range of 0.1 times to 0.5 times the maximum length of thefirst exit surface, the first exit surface may include a hemisphericalshape or an aspherical shape. A plurality of the first exit surfaces isdisposed between the first and second reflection layers in a seconddirection orthogonal to the first direction, and the second exitsurfaces are respectively disposed between the plurality of first exitsurfaces, wherein the substrate, the first reflective layer, and thesecond reflective layer may vertically overlap the first and second exitsurfaces. The substrate, the resin layer, the first reflective layer,and the second reflective layer may include a recess portion concave inthe direction of the first surface toward the second exit surface. Theresin layer includes a third surface on the first reflective layer and afourth surface under the second reflective layer, and the intervalbetween the third and fourth surfaces may be the same as the distancebetween the first and second reflective layers.

According to an embodiment of the invention, the lighting device mayprovide a line-shaped surface light source and improve the luminousintensity of the light source. The dark portion of the surface lightsource may be reduced and light uniformity may be improved by the lightemitting devices disposed in different rows in the lighting device. Thelight loss of the lighting device may be reduced and the lightefficiency may be improved. Since the light source in the form of a lineis provided through one side of the lighting device having a thinthickness, the degree of freedom in design of the lighting module may beincreased.

According to an embodiment of the invention, it is possible to improvethe optical reliability of a lighting module and a lighting devicehaving the same. It is possible to improve the reliability of a vehiclelighting device having the lighting module. It may be applied to a lightunit having the above lighting module, various types of display devices,a surface light source lighting device, and a vehicle lamp.

Any reference in this specification to “one embodiment,” “anembodiment,” “example embodiment,” etc., means that a particularfeature, structure, or characteristic described in connection with theembodiment is included in at least one embodiment of the invention. Theappearances of such phrases in various places in the specification arenot necessarily all referring to the same embodiment. Further, when aparticular feature, structure, or characteristic is described inconnection with any embodiment, it is submitted that it is within thepurview of one skilled in the art to affect such feature, structure, orcharacteristic in connection with other ones of the embodiments.

Although embodiments have been described with reference to a number ofillustrative embodiments thereof, it should be understood that numerousother modifications and embodiments can be devised by those skilled inthe art that will fall within the spirit and scope of the principles ofthis disclosure. More particularly, various variations and modificationsare possible in the component parts and/or arrangements of the subjectcombination arrangement within the scope of the disclosure, the drawingsand the appended claims. In addition to variations and modifications inthe component parts and/or arrangements, alternative uses will also beapparent to those skilled in the art.

What is claimed is:
 1. A lighting device comprising: a substrate; aplurality of light emitting devices disposed on the substrate; a firstreflective layer disposed on the substrate; a resin layer disposed onthe first reflective layer; and a second reflective layer disposed onthe resin layer, wherein the resin layer includes a first surface fromwhich light emitted from the plurality of light emitting devices isemitted, and a second surface opposite to the first surface, wherein theresin layer includes a third surface and a fourth surface opposite tothe third surface, wherein the resin layer is disposed between the firstreflective layer and the second reflective layer, wherein the thirdsurface of the resin layer is disposed on the first reflective layer,wherein the second reflective layer is disposed on the fourth surface ofthe resin layer, wherein the plurality of light emitting devicesincludes a first light emitting device disposed in a first row and asecond light emitting device disposed in a second row, wherein the firstsurface of the resin layer includes a first exit surface facing to thefirst light emitting device and having a first curvature, and a secondexit surface facing to the second light emitting device and having aflat surface or a second curvature, wherein a plurality of first lightemitting devices is arranged in the first row, and wherein a pluralityof second light emitting devices is arranged in the second row.
 2. Thelighting device of claim 1, wherein the first exit surface has a samethickness as a thickness of the resin layer.
 3. The lighting device ofclaim 2, wherein the first exit surface is disposed between the firstreflective layer and the second reflective layer.
 4. The lighting deviceof claim 1, wherein the second exit surface has a same thickness as athickness of the resin layer.
 5. The lighting device of claim 4, whereinthe second exit surface is disposed between the first reflective layerand the second reflective layer, and wherein a minimum distance betweenthe first surface and the second surface is greater than the thicknessof the resin layer.
 6. The lighting device of claim 1, wherein the resinlayer includes a convex portion having the first exit surface, whereinthe convex portion includes an upper surface on which the third surfaceextends flat.
 7. The lighting device of claim 6, wherein the convexportion includes a lower surface on which the third surface extendsflat.
 8. The lighting device of claim 7, wherein a thickness of theconvex portion is equal to an interval between the first reflectivelayer and the second reflective layer.
 9. The lighting device of claim1, wherein the resin layer includes a plurality of convex portionshaving the first exit surface, respectively, wherein the plurality ofconvex portions is disposed between the first reflective layer and thesecond reflective layer.
 10. A lighting device comprising: a substrate;a plurality of light emitting devices disposed on the substrate; a firstreflective layer disposed on the substrate; a resin layer disposed onthe first reflective layer; and a second reflective layer disposed onthe resin layer, wherein the resin layer includes a first surface fromwhich light emitted from the plurality of light emitting devices isemitted, and a second surface opposite to the first surface, wherein theresin layer includes a lower surface and an upper surface opposite tothe lower surface, wherein the resin layer is disposed between the firstreflective layer and the second reflective layer, wherein the lowersurface of the resin layer is disposed on the first reflective layer,wherein the second reflective layer is disposed on the upper surface ofthe resin layer, wherein the plurality of light emitting devices isarranged in at least one row, wherein the first surface includes aplurality of first light exit surfaces facing each of the plurality oflight emitting devices, and at least one second exit surface disposedbetween the plurality of first light exit surfaces, wherein each of theplurality of first exit surfaces includes a convex surface, wherein theresin layer includes a plurality of convex portions having each of theplurality of first exit surfaces, and wherein each of the plurality ofconvex portions includes a flat upper surface extending from the uppersurface of the resin layer and a flat lower surface extending from thelower surface of the resin layer.
 11. The lighting device of claim 10,wherein each of the plurality of first exit surfaces has a samethickness as a thickness of the resin layer.
 12. The lighting device ofclaim 11, wherein each of the plurality of convex portions is disposedbetween the first reflective layer and the second reflective layer. 13.The lighting device of claim 10, wherein the second exit surface has asame thickness as a thickness of the resin layer.
 14. The lightingdevice of claim 13, wherein the second exit surface is disposed betweenthe first reflective layer and the second reflective layer.
 15. Thelighting device of claim 10, wherein the second surface is disposedbetween the first reflective layer and the second reflective layer andhas a same thickness as a thickness of the resin layer.
 16. The lightingdevice of claim 10, wherein the upper surface of each of the pluralityof convex portions has a hemispherical shape.
 17. The lighting device ofclaim 16, wherein the lower surface of each of the plurality of convexportions has a hemispherical shape.
 18. The lighting device of claim 10,wherein the upper surface and the lower surface of each of the pluralityof convex portions are parallel, wherein a minimum distance between thefirst surface and the second surface is greater than a thickness of theresin layer.
 19. The lighting device of claim 10, wherein the secondconvex surface has a flat surface or a second curvature.
 20. A lightingdevice comprising: a substrate; a plurality of light emitting devicesdisposed on the substrate; a first reflective layer disposed on thesubstrate; a resin layer disposed on the first reflective layer; and asecond reflective layer disposed on the resin layer, wherein the resinlayer includes a first surface from which light emitted from theplurality of light emitting devices is emitted, and a second surfaceopposite to the first surface, wherein the resin layer includes a thirdsurface and a fourth surface opposite to the third surface, wherein theresin layer is disposed between the first reflective layer and thesecond reflective layer, wherein the third surface of the resin layer isdisposed on the first reflective layer, wherein the second reflectivelayer is disposed on the fourth surface of the resin layer, wherein theplurality of light emitting devices includes a first light emittingdevice disposed in a first row and a second light emitting devicedisposed in a second row, wherein the first surface of the resin layerincludes a first exit surface facing to the first light emitting deviceand having a first curvature, and a second exit surface facing to thesecond light emitting device and having a flat surface or a secondcurvature, wherein the first exit surface has a same thickness as athickness of the resin layer.